全国名师优秀公开课--it的用法

高考考查动向：1.It作指示代词的替代作用2.It构成的习语，固定搭配，作形式主语或形式宾语的特殊用法3.强调句型1)Who’sit?_________me.2)Lookatthepicture._____isapictureofourschool.It’sIt2._______________________________________---Isthisjacketyours?---Yes,______is.itit做代词一.基本用法:用于代替指示代词this和that.1.________________________________________用作人称代词，代表前面提到的人或事物,也可以指动物或婴儿(未知性别的婴儿或孩子):(自主探究):3.________________________________________1)Itishalfpasteightnow.2)It’sonlyhalfanhour’swalkfromheretoourschool.3)Ihopethatitwillbefinetomorrow.4)Ithasrainedmuchthisyear.5)It’sspringnow.6)It’squiethere.TimeDistanceWeatherWeatherSeasonCircumstance用以表示时间、距离、天气、气候、季节、环境等1.Itisimportanttoknowyourlimitations.2.Itisagoodideatohavealittlenotebookathand.3.Itisnotworthwhilequarrellingwithhim.4.Itisstrangethatithasn’tbeennoticedbefore.5.Ithappenedthattheharvestwashadthatyear.6.Itisstillaquestionhowmanypeoplewillbelieveyou.7.ItisnobusinessofyourswhereIspendmywinter.8.Itwasclearenoughwhathemeant.你知道下列句中“it”分别指什么吗?1.Itisimportanttoknowyourlimitations.2.Itisagoodideatohavealittlenotebookathand.3.Itisnotworthwhilequarrellingwithhim.4.Itisstrangethatithasn’tbeennoticedbefore.5.Ithappenedthattheharvestwashadthatyear.6.Itisstillaquestionhowmanypeoplewillbelieveyou.7.ItisnobusinessofyourswhereIspendmywinter.8.Itwasclearenoughwhathemeant.替代作主语的___________________而把真正作主语的___________________置于句尾。Summary:it用作形式主语从句,动词不定式、动词-ing，从句、动词不定式、动词-ing二.it做形式主语（1）It+be+名词+that从句e.g.Itis______________________________that…（2）It+be+形容词+that从句e.g.Itis______________________________that…（3）It+不及物动词+that从句e.g.It________________________________that…（4）It+be+动词的过去分词+that从句e.g.Itis______________________________that…apity/ashame/anhonor/asurprise/awonder/nowonderimportant/likely/possible/strangeseems/happens/appearssaid/believed/known/reported常见形式：（it做形式主语（5）It+be+形容词/名词+(forsb./ofsb.)+todoe.g.It’scarelessofhertomakeaspellingmistake.It’shardformetofinishitintwodays.It’smydutytotakecareofallthestudents.（6）It+be+名词+doinge.g.It’s_____________________________doingsth.nouse/nogood/awasteoftime(1).Itisapity(ashame/anhonor/agoodthing/afact/asurprise/...)that...注意1:(2).Itisimportant(necessary，strange，natural...)that...(3).Itissuggested(ordered/demanded/insisted/commanded...)that...(建议，命令,请求，)that后的从句要用虚拟语气（should+动词原形），should可以省Itisv-edthat…=sb./sth.____________is/arev-edtodo1.ItissaidthatTomisafaithfulworker.1.Itisreportedthatheiswritinganinterestingnovel.2.Itisbelievedthatallthestudentshavedonetheirbest.=Tom_____________afaithfulworker.issaidtobe=He____________________aninterestingnovel.isreportedtobewriting=Allthestudents_______________________theirbest.arebelievedtohavedone注意2:三.it做形式宾语Itiswrongtocheatinanexamination.(1.)Iconsideritwrongtocheatinanexamination.(2.)Don'tyoufinditawasteoftimewatchingtelevisiontoomuch?(3.)IthoughtitstrangethatJackshouldhavehadsomuchmoneytospendthesedays.“主语+动词+_______________+_______________it+形容词/名词1.Ilike(enjoy,hate…)itwhen….2.Iwouldappreciateitif…3.…seeto(dependon…)itthat…特别提醒:不定式/动词-ing/that从句”Ithinkit______________withhim.我认为和他争吵没有用。Ifoundit_______________tostudyEnglish.我发现学英语非常有趣。Hemadeit______thathewasnotinterestedinthissubject.他非常清楚地表示他对那门学科不感兴趣。nousearguingveryinterestingclear常跟形宾it的动词有think,believe,make,find,consider,feel等。四.it的模糊指代1.Ican’thelp___ifsheisalwayslate.2.Ihate___whenpeopletalkwiththeirmouthfull.3.Idon’tlike___whenaChinesehostkeepsservingmethefoodIdon’tlike.4.I’dappreciate___ifyoucangivemesomeusefulinformation.ititititit用来指代后面从句的情况(1).Itwasabout600yearsagothatthefirstclockwithafaceandanhourhandwasmade.(2).Itwastheythat(who)cleanedtheclassroomyesterday.(3).ItwasinthestreetthatImetherfather.1.Itis+被强调部分+that/who(人)...强调句的一般疑问句句型：五.it的重要句型Is/Was+it+所强调的部分+that/who(人)…?强调句的特殊疑问句句型：特殊疑问词+is/was+it+所强调的部分+that/who…?注意:1).被强调部分是:____________________主语，宾语，表语或状语2).not...until...的强调形式:Itis/wasnotuntil…+that...“直到…才…”Ididn'trealizeshewasafamousfilmstaruntilshetookoffherdarkglasses.→Itwas_________shetookoffherdarkglasses____Irealizedshewasafamousfilmstar.→_________shetookoffherdarkglasses____Irealizeshewasafamousfilmstar.Notuntildidnotuntilthat3).语序:我问他究竟为什么不能回答这个问题.Iaskedhim______________hecouldn’tanswerthequestion.whyitwasthat混淆的其它从句①强调句型中前后时态应一致;②被强调的部分为主语、宾语和状语,若把itis／was和that／who去掉,剩下的词语能重新组成正确的句子,而且不缺成分,否则就是其它从句。Itwasin1945thatWorldwarIIended.________Itwas1945_____worldwarIIended.(________)③ItwasalongtimesinceImetyoulast.(时间状语)Itistimethatyouwenttobed.(_________)(强调句)whenIn1945that定语从句强调句定语从句2.Itistime(abouttime/hightime)thatsb._______did/shoulddo3.Itisthefirst(second...)timethatsb.________have/hasdonewas________haddone4.It________________+时间段....since…didis/hasbeen5.It_____________+时间段...before...was/willbe6.Ittakessb....todosth.7.Itdoesn’tmatterwhether(if)...=Thisisthefirsttime五.it的重要句型1.It’syears___(since,before,after,that)Ipaintedthisbeautifulpicture.2.Itwillbeyears___(since,before,after,that)Ipaintthisbeautifulpicture.3.Itwasyears___(since,before,after,that)Ipaintedthisbeautifulpicture.4.It’sforyears___(since,before,after,that)Ihavepaintedthisbeautifulpicture.易误辨析:表示从since从句谓语动作发生